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Preparation of nanometer composite light catalyst

A nano-composite, photocatalyst technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of high specific surface and pore volume of xerogels, complex equipment, and difficult conditions. , to achieve good stability and catalytic activity, enhance charge separation, and inhibit recombination

Inactive Publication Date: 2005-05-11
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the following problems need to be solved urgently. (1) Although nano-titanium dioxide can be prepared by various methods, such as chemical vapor deposition, chemical precipitation, etc., due to the complex equipment, difficult conditions, high cost or large pollution, etc. Difficult to industrialize
(2) Due to the wide band gap (3.2eV) of titanium dioxide, only about 4% of the ultraviolet light in sunlight can be used
Therefore, due to the effect of surface tension, the specific surface and pore volume of the prepared xerogels cannot be very high, thus limiting their applications.

Method used

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  • Preparation of nanometer composite light catalyst
  • Preparation of nanometer composite light catalyst

Examples

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Embodiment 1

[0040] Implementation Example 1: Measure a certain amount of dilute titanium sulfate solution, and weigh Fe(NO) in a molar ratio of Ti:Fe to be 1:0.15 3 Add to titanium sulfate solution, add 10ml AEO-3 and stir for 3 hours, titrate with sodium hydroxide to pH 8-9, get hydrogel, age for 16 hours, wash by centrifugation, exchange water with methanol, move to high pressure reaction Supercritical reaction was carried out in the kettle to obtain airgel powder, and the obtained powder was calcined in a muffle furnace at 500°C for 1 hour to obtain a nanocomposite photocatalyst, and the degradation rate of phenol was measured. Under lamp irradiation, the degradation rate of 100ppm phenol after 6 hours is 81%, and the particle size measured by XRD and TEM is 12nm.

Embodiment 2

[0041] Implementation Example 2: Take 20ml of isopropyl titanate liquid and dissolve it in 80ml of absolute ethanol. The molar ratio of Ti:Ce is 1:0.03, and take Ce(NO) 3 Add the solution to the above solution, add 3ml of triethanolamine, stir vigorously for 3 hours, drop potassium hydroxide until the pH is 8-9, age for 10 hours, wash by centrifugation, replace the solvent with ether, and move it to a high-pressure reaction kettle. Supercritical reaction to obtain airgel powder, calcining the obtained powder in a muffle furnace at 600 ° C for 1 h to obtain a nanocomposite photocatalyst, and measuring the degradation rate of the mixture of chloroform and carbon tetrachloride, Under the irradiation of 9w, 365nm ultraviolet lamp, the degradation rate of 300ppm trichloromethane and carbon tetrachloride mixed solution reaches 56% after 8 hours, and the particle size measured by XRD and TEM is 25nm.

Embodiment 3

[0042] Implementation Example 3: Measure 10ml of n-butyl titanate liquid and dissolve it in 50ml of absolute ethanol. Measure Zn(NO 3 ) 2 Add the solution to the above solution, add 12g of polyethylene glycol, stir vigorously for 2 hours, add sodium carbonate until the pH is 8-9, age for 20 hours, centrifuge and wash, replace the solvent with ethane, and move to a high-pressure reactor Perform supercritical reaction to obtain airgel powder, calcinate the obtained powder in a muffle furnace at 600° C. for 1 h to obtain a nanocomposite photocatalyst, and measure the degradation rate of methyl orange. Under the irradiation of 9w, 365nm ultraviolet lamp, the degradation rate of 100ppm methyl orange solution reaches 96% after 2 hours, and the particle size measured by XRD and TEM is 8nm.

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Abstract

A process for preparing the nano-class composite photocatalyst includes such steps as preparing TiO2 aerogel by supercritical technique, and osmosizing metallic ions into TiO2 main body. Its advantages are high catalytic activity, wide trigger range moving from UV to visual light, and high degradability to hydrocarbon, oily sewage and more pollutants.

Description

technical field [0001] The invention relates to technologies such as providing a new process for preparing a nanocomposite photocatalyst, modifying the catalyst, and the like. These include supercritical fluid combination technology to prepare nano-binary or ternary composite photocatalysts, and modify titanium dioxide as the main body by doping different elements to improve the photocatalytic activity, and the excitation range is from ultraviolet light to sunlight It has achieved remarkable effect on the degradation of organic pollutants and is a new generation of environmentally friendly catalyst. Background technique [0002] In 1972, Fujishima and Honda published on Nature impurities about TiO 2 The paper on the photo-splitting of water on the electrode can be seen as a sign of the beginning of a new era of heterogeneous photocatalysis. Since then, the research on semiconductor photocatalysis has attracted widespread attention from scientists in the fields of internati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J37/03
Inventor 张敬畅冯立叶曹维良
Owner BEIJING UNIV OF CHEM TECH
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